The air-foam flooding technique which combines the advantage of air injection displacement and foam flooding has enhanced the sweep efficiency and oil displacement efficiency and achieved well application effect in middle-high temperature reservoirs, however, it is less applicable in shallow ultra-low permeability and low temperature reservoirs. According to the reservoir characteristics of ultra-low permeability reservoirs in Northern Shaanxi, we analyzed the suitability of the air-foam flooding technique in these reservoirs through theoretical studies, laboratory test and field test, taking Tang 114 well area in Ganguyi oil field as an example. The results show that the crude oil in low permeability layers is obvious motivated in the lab experiment, the oil displacement efficiency rises from 8. 33% to 50. 55%, the water content of the field test well group decreased from 98% to 73%, the daily fluid production rate dropped 2 m3 , and the daily oil production is 6 times of that of the original. The air-foam flooding technique has strong suitability in Ganguyi oil field and oil recovery can be greatly enhanced. It has certain reference significance for stabilizing oil output and controlling water content for the similar reservoirs.